Use pug

sql/migrations/patches/20190925000000-updated-at/up.sql

@@ -0,0 +1,11 @@
+CREATE OR REPLACE FUNCTION set_updated_timestamp()
+RETURNS TRIGGER AS $$
+BEGIN
+   IF row(NEW.*) IS DISTINCT FROM row(OLD.*) THEN
+      NEW.updated_at = now(); 
+      RETURN NEW;
+   ELSE
+      RETURN OLD;
+   END IF;
+END;
+$$ language 'plpgsql';